Chandy–Lamport algorithm

Source: Wikipedia Topic: Recording a consistent global state in an asynchronous distributed system.

Core idea

The Chandy–Lamport algorithm captures a consistent global state of an asynchronous system without stopping the world.

Key claims

• A useful snapshot is a consistent cut, not just a pile of local states captured at arbitrary times.
• Replay, audit, and debugging get much cleaner when the system can name such cuts explicitly.
• Snapshotting is a semantic operation over a distributed run, not merely a storage backup trick.

Harness takeaway

The studio should have first-class consistent cuts for replay, review bundles, incident reports, and approval checkpoints.